Module: Wiretap::PPM

Defined in:
ext/ppm.cpp

Class Method Summary collapse

Class Method Details

.format(input) ⇒ Object

Extract Wiretap clip format from PPM file. The format will inherit the bit depths of the image and allocate the framebuffer size into which the imported image will fit

@clipformat = Wiretap::PPM.format("test/wiretap-images/01.ppm")



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# File 'ext/ppm.cpp', line 75

static VALUE wiretap_get_ppm_format(VALUE self, VALUE input) {

	FILE* infile = fopen(CSTR(input), "r");
	if(!infile) {
		THROW("Couldn't open file %s for reading", CSTR(input));
	}
	WireTapClipFormat format;
	if(!ppm_read_format(infile, &format)) {
		fclose(infile);
		return Qfalse;
	}
	fclose(infile);
	VALUE clip_format = rb_funcall(cClipFormat, rb_intern("new"), 0);
	DATA_PTR(clip_format) = new WireTapClipFormat(format);
	return clip_format;
}

.to_sgi(input, output) ⇒ Object

Convert a PPM file to an SGI file

Wiretap::PPM.to_sgi("test/wiretap-images/01.ppm", "/tmp/a.sgi")



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# File 'ext/ppm.cpp', line 97

static VALUE wiretap_convert_ppm_to_sgi(VALUE self, VALUE input, VALUE output) {
	Check_Type(input, T_STRING);
	Check_Type(output, T_STRING);
	FILE* infile = fopen(CSTR(input), "r");
	if(!infile) {
		THROW("Couldn't open file %s for read", CSTR(input));
	}
	WireTapClipFormat format;
	if(!ppm_read_format(infile, &format)) {
		fclose(infile);
		rb_warn("Couldn't read PPM format from file %s", CSTR(input));
		return Qfalse;
	}
	
	unsigned char frame[format.frameBufferSize()];
	if(!ppm_read_image(infile, frame, format.width(), format.height(), format.bitsPerPixel())) {
		fclose(infile);
		rb_warn("Couldn't read PPM image data from file %s", CSTR(input));
		return Qfalse;
	}
	fclose(infile);

	if(!wiretap_write_image_frame(format.width(), format.height(), format.bitsPerPixel(), frame, CSTR(output))) {
		rb_warn("Couldn't dump image to file %s", CSTR(output));
		return Qfalse;
	}
	return Qtrue;
}